Doffing apparatus for mangles



Sept. 29, 1925.

W. J. ASHER DOFF-ING APPARATUS FOR-ANGLES Filed Dec. 2; 1921 [fix/6mm,

Patented Sept. 29, 1925.

UNITED STATES WILLIAM J. ASHER, OF COLORADO SPRINGS, COLORADO.

DOFFING APPARATUS FOR MANGLES.

Application filed December 2, 1921. Serial No. 519,471.

To all whom it may concern:

Be it known that I, WILLIAM J. AsHER, a citizen of the United States,and residing at Colorado Springs, El Paso County, State of Colorado,have invented certain new and useful Improvements in Dofiing Apparatusfor Mangles, of which the following is a specification.

This invention relates to laundry ironing machines or mangles of therotary drum type and particularly to the doffing mechanism forcontinuously removing the work from the rotating drum.

One object of the invention is to provide an improved bar for supportingthe doffing knives which may be quickly and easily removed from themachine for the purpose of adjusting the knives or replacing one or moreof the dotting tapes. To this end the dofling bar is mounted in theframe in'a novel manner so that it may be withdrawn without difficultyfrom its operative position, to a position in which the knives may bereached by the operator and replaced with ease. By thus displacing thedoffing bar renewal of the doffing tapes may also be accomplished.Another feature of the invention resides in the novel manner in whichthe dofling knife supporting arms are pivotally connected to the doffingbar. Additional objects and advantages of the present invention residein the simple construction of the dofiing bar and knife holding arms,enabling the same to be made more cheaply than theretofore.

The invention will be fully set forth in the following description whentaken in connection with the accompanying drawings in which:

Figure 1 is a section through a portion of a rotary drum mangle showingthe improved dofiiug bar construction;

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 is a plan view of one end of the dofling bar showing the meansfor supporting this end in the frame; and

Figure 4: is an enlarged sectional View through the doffing bar and adoffing knife.

The type of mangle to which. this invention is especially adapted to beapplied is described and illustrated in my Patent No. 1,354,871 datedOctober 5, 1920. It will be understood, however, that the invention isapplicable to other types of rotary drum mangles and is not limited inits application and the drum 11 is mounted for rotation in,

this frame. Rollers 12, 13 and 14, the axes of which are parallel to theaxis of the drum, are mounted at one side thereof and extending aroundthe rollers 12 and 13 and around the drum is an endless apron 15 whichmoves with the drum in the direction of the arrow and serves to hold thework against the drum in its rotation. Rollers 13 and 14 are supportedby levers L and M respectively, these levers being in turn pivoted onthe frame and adapted to be manually manipulated to raise and lower therollers, as described in my prior patent. The work is fed in between theroller 12 and the short endless dofiing tapes 16 which pass under thewedge-shaped dofling bar 17 and over the roller 14. After having passedaround the drum the work is removed therefrom by the dofiing knives 18in well known manner, and the dofiing knives are kept clear by theaction of dofling tapes 16 and the endless apron 15 which grip the workbetween them and carry it around the roller 13. It is then carried overthe machine tothe oppo site side thereof on the upper turn of theendless apron 15.

The dofiing knives 18 are T-shaped and have their stems secured to knifecarrying arms 19 by screws 20. Small screws 21 are provided foradjusting the angle of the dofiing knives relatively to the arms 19, sothat their edges may bear equally against the drum 11. Rectangularopenings are left between the stems of the knives and arms 19 andthrough these openings the dofling tapes 16 extend.

The dofling bar is triangular or wedgeshaped in cross section and isprovided with the upwardly projecting flange 17 the inner face of whichcomprises an abutment against which the outer or rear edge of each ofthe knife holding arms 19 is adapted to bear. Each of the knife holdingarms is formed with a recess in its rear edge at one end, and pins 23secured to and extending upwardly from the upper surface of the doffingbar adjacent. the flange 17 fit loosely in these recesses and comprisemeans for separating and preventing longitudinal displacement of thearms 19. In the opera:

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tion of the mangle the arms are fr:;e to move or pivot about their rearedges to allow the knife edges to move inwardly or outwardly tocompensate for inequalities in the surface of the rotating drum.

The dofling bar is supported at its ends (only one of which .isillustrated) in bracket 24 secured to the frame, each bracket having aninwardly extending flange 25 and an aperture 26 adapted to receive thepin 27. The flange 25 is cut away as shown at 28 but has upper and lowerbearing surfaces 29 and 30 respectively, against which one face of thedotting bar rests. Another face of the dofling bar rests against thefiat face 31 of the pin 27 and the end of the bar is adapted to engagethe inwardly facing shoulder 32of the pin 27, when the bar is inposition, thereby locking the pin in the aperture 26. The bar istherefore wedged by its own weight in between the flange 25 and pin 27,which together comprise a supporting cradle.

The bar may be removed in either of two ways, by lifting the rollers bymeans of the levers and then lifting the bar from its supporting cradle,or by removing the pins 27 In removing thebar by the second methodmentioned it is only necessary to raise it slightly to disengage itsends from the shoulders 32 of pins 27, which may then be easilywithdrawn from recess 26. After the removal of the pins the bar may belowered or drawn outwardly away from the drum for the purpose ofreplacing one or more of the dofiing tapes 16. For the purpose offacilitating the removal of the pin 27 an aperture 33 is provided in thebracket so that an instrument may be inserted therethrough tocontactwiththe end of the pin to force it from the socket 263.

By employing the above described means for supporting the bar in theframe it can be quickly removed, and as quickly replaced in'position.The shape of the bar with the projecting flange 17 is such that-it maybe made of cold rolled steel instead of cast steel, as heretofore; thepins 23 being inserted after thebar hasbeen cut to length and avoidingthe necessity of having special ears formed integral with or secured tothe bar for the purpose of pivotally supporting the arms 19, whichconstruction has been heretofore used. It will be obviousto thoseskilled in the art that the design and arrangement of parts of theinvention may be varied and the invention is not limited therefore tothe exact embodiment described.

Having thus described the invention what I claim as new and desire tosecure by Letters Patent is:

1. In a mangle, in combination, a frame, a rotary drum, dofling meansfor removing the work from the drum, including a doffing bar having itsaxis parallel to the axis of the drum, and means for removablysupporting the bar in the frame, said means including a two-part cradleupon which one end of the bar rests, one portion of the cradle beingrigidly secured to the frame and the other portion being detachablysecured thereto so that it may be readily removed to allow the bar to belowered.

2. In a mangle, in combination, a frame, a rotary drum, dofling meansfor removing the work from the drum, including a dotting bar having itsaxis parallel to the axis, ofthe drum and being wedge-shaped in crosssection, and means for removably supporting the bar in the frame, saidmeans including a member rigidly secured to the frame and a memberdetachably secured to the frame, one end of thebar resting on andextending downwardly between both of said members and being supportedthereby,the detachable member being adapted to bereadily detached sothat the bar may be removed.

3. In a. mangle, in combination, a frame, a rotary drum, dofiing meansfor removing the work from the drum, including a'doiiing bar having itsaxis parallel to the axis of the drum, andmeans for removably supportingthe 'bar in the frame, said means including a member rigidly secured tothe frame and a pin fitting in an aperture in the frame, said member andpin both extending laterally from the frame and adaptedto'jointlysupport one end of the bar, said pin and bar having mutually engagingportions whereby the pin is locked in supportinn position when the baris resting thereon "'ut is released when the bar is raised,WhGIEHPOIl'll] may be removed fromthe aperture and the bar lowered.

4L. In a mangle, in, combination, a frame, a rotary drum, doffing meansforremoving'the work from the drum, including a wedgeshaped dofiing barhaving its aXislPar-allel'to the axis of the drum, and means forremovably supporting the bar inthe 'frame,said means including a flangeextending laterally from the frame and pin spaced therefrom andremovably supported in an aperture in the frame, the bar being wedgedbetween said pin and flange and supported thereby but adapted to belowered when the pin'is removed.

5. In a mangle, in combination, a rotary drum, and means for doffing thework from said drum, said means including a bar having a substantiallyvertical abutment facing the drum, a pin secured to the bar in front ofthe abutment and extending vertically upwardly, and a knife carrying armhaving its rear edge bearing against said abutment and extending towardthe drum, said arm having an aperture adapted to receive the upwardlyprojectingpin but beingfreelyremovable at all times from said bar.

6. In a mangle, in combination, a rotary drum, and means for dotting theWork from said drum, said means including a bar having an abutmentfacing the drum, a knife supporting arm having a portion bearing againstsaid abutment and having a notch in one end, a pin secured to said barand extending through said notch, and a second pin secured to said barand positioned adjacent the opposite end of said arm.

7. In a mangle, in combination, a rotary drum, and means for dofiing theWork from said drum, said means including a bar having an abutmentfacing the drum, a series of knife supporting arms having portionsbearing against said abutment and pins secured to said bar and extendingbetween the adjacent ends of the knife supporting arms to hold the samein spaced relation.

In testimony whereof I hereunto affix my signature.

WILLIAM J. ASHER.

